/**
***********************************************************************
*
* Copyright 2011 Stefan Wöhle
*
* This file is part of PixelMath
*
* PixelMath is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* PixelMath is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with PixelMath. If not, see <http://www.gnu.org/licenses/>.
*
***********************************************************************
*/

#include "formula.h"
#include "formulaexception.h"

QImage Formula::sourceImage;

/*static*/ void Formula::setSourceImage(const QImage& src)
{
    sourceImage = src;
}

void Formula::checkPreconditions(int x, int y)  // throws FormulaException
{
    if (Formula::sourceImage.isNull())
        throw FormulaException(tr("SourceImage is invalid."), INVALID_SOURCE_IMAGE, this);

    if (x < 0 ||
        y < 0 ||
        x > Formula::sourceImage.width() ||
        y > Formula::sourceImage.height())
        throw FormulaException(tr("Parameters are out of range."), PARAMS_OUT_OF_RANGE, this);
}
